Mechanism for making molds



NOV. 11, 1930. Y T ET AL 1,781,126

MECHANISM FOR MAKING MOLDS Filed Aug. 2,- 1928 2 sheets sheet l A TTORN Ki v NOV. 11, 1930. OYSTER ET AL 1,781,126

' MECHANISM FOR MAKING MOLDS 2 Sheets-Sheet 2 Filed Aug. 2, 1928 I I. 1 I l J g PM m m V 7 N .7 4 7 d f 3 3 w you ra -m s I 9 Ha WU .IJ 5 0 00 1 r w 9 Q 2 Z v 61% Avai Patented Nov. 11, 1930 use STAT EAR-L F. OYSTER, OF CLEVELAND HEIGHTS,

AND FRANCIS N. GILLILAND, O1 SHAKER HEIGHTS, OHIO, ASSIGNOBS TO THE OSBOBN MANUFACTURING COMPANY, OF CLEVE- LAND, OHIO, A CORPGRATION OF OHIO MECHANISM FOR Application filed August 2,

The present invention relates, as indicated, to a method of and mechanism for making molds, and more particularly to a: mold making machine including improved means for strippin patterns from molds. lhe primary object or the invention is to provide a machine of the character described which shall be relatively simple in construction, extremely efficient in operation, and relatively inexpensiveto manufacture. Further objects of the invention will appear as the description proceeds. To the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointedout in the claims.

Theannexed drawing and the following description set forth in detail certain mechanism embodying the'invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings:

Fig. 1 is a side elevation of a machine incorporating the present invention, aportion thereof being broken away, substantially on the line 1-1 of Fig. 3, andlooking in the direction of the arrows; Fig. 2 is afront elevation of said machine on a reduced scale; and Fig. 3 is a fragmentary sectional view .taken substantially on the line 3-3 of Fig. 1.

, Referring more particularly to the drawings, it will be seen that the machine comprises a Cshaped frame including or mounting a base 11 formed" with a substan tially central chamber 12 in which are received a'squee'ze piston 13 and a jolt piston 14 nested in said squeeze piston. As will be obvious, the piston 13 is slidable in the chamber 12 while the piston 14 isalso slidable within the piston 13. The piston 14 is formed or provided at its end with a platform 15 carryin g a. flask-receiving frame 16.

Ateach end, said base 11 is formed with a chamber 17, a portion 18 ofwhich is cylindrical as shown, and an annular wall 19 forms a continuation ofsaid cylindrical portion .18. 'Within each said cylindrical portion there is mounted a. piston 20 carrying or formed with a pair of laterally projecting arms 21 and 22 MAKING uoLn-s.

1928. Serial No. 296,883.

at its upper end; As will be obvious, the arms v 21 and 22'are carried out-side ofthe cylindrical portion 18 but within the chamber 17. Said arm 21 is formed atits outer end with a relatively deep socket 23, and the arm'22 is formed with a. similar socket 24. The uperture 28 receives a bushing 29 through which the upper ends of the rods 26 and 27 slidably project. A stop member 30 is carried by said head member 25 intermediate the apertures 28 therein, and a similar stop member 31 is carried by said'piston 2O atits upper end. Each ofthe rods 26 and 27 is-provided adjacent its upper end with adjusting-mechanism -32whereby the exact-position of the upper end 33'of each rod maybe adjusted.

A control valve-34 provided with an operating handle 35 is connected by a-pipe line 36 with asource of fluid under pressure and a pipeline 37 leads from said valve toa pair :of branch pipes (not-shown) communicating respectively-with the chamber at the base of the piston13 and-the chamber within sa-idpiston at thebaseof the piston 14, while a pipe line 38Lleads from said valve'to branches 39 and 40.0pening respectively into the bases'of the two cylindricalportions 18 of the chambers 17. As is clearly illustrated in Fig. 3, the branches 39 and 40 are connected with passages 41 formed in removable closures secured in place over the lower ends of the cylindrical portions 18* and of the chambers 11 said closures being formed with expansion chambers 42.

'The operation offthe above described device is as follows. An empty flask 43 is set V on the frame 16 and is filled with sand, it

being understood that apattern is resting on the platform 15'and projects into said flask.

The valve 34 is operated to admit air or other fluid'to thechamber at the base of'the piston 14, and suitable mechanism is provided whereby'the platform 15 is jolted or rapidly vibrated. Thereafter, the handle 35 of the valve 34 is set in a second position which causes the admission of fluid under pressure to the chamber at the base of the piston'13 to elevate the platform untilthe sand the flask 43is brought into, contact with a suitable member carried by the head 44. With the handle 35 in this position',;heavy pressureis' applied'to the piston 13, whereby the sandin the flask 35 is squeezed between the platform; 15 and the member carried by the head 44. In this position of'tlie'valve handle 35, fluid is also admitted to the two cylindrical portions 18 to cause elevation of the pistons 20. As will be obvious, saidpistons,being entirely independent of each other, may move upwardly at different rates, but the valve apertures are soproportioned that neither piston 20 may move as fast ,as does the piston 13, and that the stop members 3lrofbot hpis- .tons 20will contact with the stop-members before the squeezing operation hasb'een com-\- pleted. Thus it will be seenthat provision has been made forbringing the upper ends 33 of b'othstripper units to a common level, even though thetwo units'are entirely "independent of'eacli other. In some cases, it is found that thejframe 16 becomes warped, and under such circumstances, the ends 33 of the stripper rods 26 and 27 may be differently set by the adjusting means 32. In the appended claims,

the language acoinmon level is to be inter pretedqtoinclude such a setting. The valve handle is now movedto a third position which causes release of the actuatingfluid g from the chamber- 12' to permit the platform 15 to move downwardly, As will besobvio'us,

' the upper ends 33 ofthe stripper rods 26 and 27 are disposed in the path of the frame 16 th'eflasktii. I

Other modes of applying the principle of ourqinvention may be employed instead of V the one explained, change beingmade as rea it distinctlyclaim as o-urinveiit on:

I. gards the mechanism'herein disclosed, pr0-' vided'tlie means stated byany ofthe followaim q V e wof suchl vzsl ated iiieanslbeem l I V I t We therefore particularly: point 1. In a ,mold' making machine, mold-carrying platform reciprocably mount 1' ed in said base,fluid" actuated means for reciprocating saidplatfornniaplurality of independent stripper: units mounted said 1 base, and fluid actuated -means for moving .spectively. V

i non upperlevel. r

ward strokes,

said unitsfinto flask-receiving position and holding the same in such position.

2. In a mold making-machine, a;base,a mold-carrying platform reciprocably mountedin said base, stripper mechanism comprising a plurality of independent reciprocablei units, means. for elevating said units, and

common vlevel, said last-named means o cosaid units insuch position.

"means forlimiting the upward movement of said units to dispose their upper ends ata a operating with sa d elevatingmeans to hold c In a mold making mach1ne,'a base, a'

moldcarrying platform reciprocably mounted in said base, stripper mechanism comprising a plurality,ofindependent reciprocable units, fluid-actuated means for elevating said units, and means for limiting theupward movement of said units, said lastnamed means cooperating with said fluid a'ctuated means to hold said unitsin position with the upper ends of said units at a common level. 4. In a mold making machine,'a base, a mold-carrying platform reciprocably mounted in said base, and stripper mechanism comprising a plurality of independent'recipro cable units, fluid. actuated means for causing reciprocation of said units, and automatic means for 'causing the upper endsof said units to assume a common level at the upper extremities of the strokesthereof. I

5. In a 'moldmaking machine, a base, a

mold-carrying platform reciprocably mount- I ed in saidbase, and stripper mechanism com V cable units, means for causing reciprocation prising a pluralityof 'independentreciproof said units, and independent stop means for limiting the upward strokes of said units, re-,

6. In a mold making machine, the combina- 3 tion of a base providing achamber, a piston in said chamber and having a'mold-carrying 7 platform at its upper end,}means for elevat t 7 ing 831d piston, and stripper mechanism comprising a p air of independent units,m'ea'ns for I felevating said units, and means'for stopping.

the upwardmovement off said units at com- I 7 A moldfma-king machine 'comprising a Y base formed with a chamber'therein adjacent each end thereof, a piston vmounted ineach such chamber, a stripper rod carried by eachl' Qof' said pistons, and means'for'j p l in fluid under pressure to each such chamber. 8. A mold making i'nachine comprising a such chamber, a stripper rod carried by each 7 of said pistons, means for supplyiiig 'fluid r under pressure to said chambers, and means mounted in said respectivechambers and adapted to cooperate'with-said pistons to causethe upper ends of'saidirods to assume '3 a common level at the extremities of their up- I V r I 1 20 J base formed with a'chamber therein adj acent i 7 each end thereof,-'a piston mounted in" each 9. A mold making machine vcomprising a base formed With a chamber therein adjacent each end thereof, a piston mounted in each such chamber, a stripper rod carried by each of said pistons, means for supplying fluid under pressure to said chambers, and separate means automatically cooperable With said respective pistons to cause the upper ends of said rods to assume a common level at the extremities of their upward strokes.

10. A mold making machine comprising a base formed with a chamber adjacent each end thereof, a portion of each of said chambers being cylindrical, a piston reciprocable in each of said cylindrical portions, a socketed arm carried by each of said pistons Without said cylindrical portions, and a stripper rod mounted in the socket of each of said arms.

11. A mold making machine comprising a base formed with a chamber adjacent each end thereof, a portion of each of said chambers being cylindrical, a piston reciprocable in each of said cylindrical portions, a pair of socketed arms carried by each of said pistons Without said cylindrical portions but within said chambers, and a stripper rod having its one end received in each of said arm sockets and its opposite end projecting out of its chamber.

12. A mold making machine comprising a base formed with a chamber adjacent each end thereof, a portion of each of said chambers being cylindrical, a piston reciprocable in each of said cylindrical portions, a pair of socketed arms carried by each of said pistons Without said cylindrical portions but Within said chambers, a stripper rod having its one end received in each of said arm sockets and its opposite end projecting out of its chamber, and means for supplying fluid under pressure to said respective cylindrical portions.

13. A mold making machine comprising a base formed with a chamber adjacent each end thereof, a portion of each of said chambers being cylindrical, independent pistons recipro'cably mounted in said cylindrical portions, a pair of socketed arms carried by each i of said pistons Without said cylindrical portions but Within said chambers, and a stripper rod having its one end received in each of said arm sockets and its opposite end projecting out of its chamber. A Signed by us this 31st day of July, 1928.

EARL F. OYSTER. FRANCIS N. GILLILAND. 

